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A New Wood-Inhabiting Mite Species of the Genus Dendroseius Karg, 1965 (Acari, Mesostigmata, Rhodacaridae) from Central Europe (Slovakia)

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A New Wood-Inhabiting Mite Species of the Genus Dendroseius Karg, 1965 (Acari, Mesostigmata, Rhodacaridae) from Central Europe (Slovakia) ZooKeys 984: 49–57 (2020) A peer-reviewed open-access journal doi: 10.3897/zookeys.984.57256 RESEARCH ARTICLE https://zookeys.pensoft.net Launched to accelerate biodiversity research A new wood-inhabiting mite species of the genus Dendroseius Karg, 1965 (Acari, Mesostigmata, Rhodacaridae) from Central Europe (Slovakia) Peter Mašán1 1 Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, 845-06 Bratislava, Slovakia Corresponding author: Peter Mašán ([email protected]; [email protected]) Academic editor: F. Faraji | Received 5 August 2020 | Accepted 24 September 2020 | Published 4 November 2020 http://zoobank.org/5EEF002A-6019-4449-B613-8A20A4F682C1 Citation: Mašán P (2020) A new wood-inhabiting mite species of the genus Dendroseius Karg, 1965 (Acari, Mesostigmata, Rhodacaridae) from Central Europe (Slovakia). ZooKeys 984: 49–57. https://doi.org/10.3897/ zookeys.984.57256 Abstract A new rhodacarid mite of the genus Dendroseius Karg, 1965, D. reductus sp. nov., was described based on females found in wood detritus and under bark of dead and dying poplar trees in a flood-plain forest in South Slovakia. The new species is unusual among the known congeners in the specifically formed triramous epistome of which the central projection is reduced in length, truncate, and markedly shorter than lateral ones. In other congeneric species, the anterior margin of the epistome possesses three pointed projections of similar size. A dichotomous key for identification of females of the world species classified in the genus Dendroseius is provided. Keywords Description, morphology, poplar tree, saproxylic habitat, systematics Introduction Dendroseius was originally described as a subgenus of Dendrolaelaps Halbert, 1915 by Karg in 1965, and treated at the generic level by Hirschmann (1974), Lindquist (1975), Evans and Till (1979), Shcherbak (1980), Karg (1993), and other acarologists. The Copyright Peter Mašán This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 50 Peter Mašán / ZooKeys 984: 49–57 (2020) modern concept of Dendroseius is largely based on above cited authors who separated the genus from other “Dendrolaelaps-like” genera primarily by the following diagnostic character states: (1) dorsal setae j2 with more posterior position, situated between setae j1 and j3, not in a transverse setal row between j1 and z1; (2) gnathosomal groove on deutosternum with seven transverse furrows of which none is reaching beyond the lateral borders of the groove; (3) movable digit of chelicera with three teeth in addition to the apical hook; (4) straight anterior margin of opisthonotal shield; (5) sperm induction system associated with coxae IV. Dendroseius is a small group of rhodacarid mites, currently includes only six known species, namely D. reticulatus Sheals, 1956 (= D. scotarius Sheals, 1958) dis- tributed mainly in Western Europe (with sporadical findings in North Africa and Cen- tral Europe), D. badenhorsti (Ryke, 1962) from South Africa, D. gujarati Wiśniewski & Hirschmann, 1989 from India, D. congoensis Wiśniewski & Hirschmann, 1992 from under bark of a tree imported to Poland from Africa, D. amoliensis Faraji, Sakenin-Chelav & Karg, 2006 from Iran, and D. vulgaris Ma, Ho & Wang, 2014 from China. Further species initially described under the subgeneric name Dendro- seius, namely Dendrolaelaps (Dendroseius) fimetariusKarg, 1965 distributed in Central Europe, is now regarded as a member of the genus Oligodentatus Shcherbak, 1980 (see Shcherbak 1980). Dendroseius species display a relatively wide spectrum of habitat specialization. Most original descriptions and subsequent reports are based on specimens found in heterogeneous soil detritus (D. amoliensis, D. reticulatus, D. vulgaris), wood substrates (D. congoensis, D. vulgaris), and manure or cow dung (D. badenhorsti, D. vulgaris) (Sheals 1956, 1958; Ryke 1962; Wiśniewski and Hirschmann 1992; Karg 1993; Faraji et al. 2006; Ma et al. 2014). Some species may show a phoretic interaction with insects because the deutonymphs of D. gujarati was found on an unidentified scarabaeid bee- tle (Wiśniewski and Hirschmann 1989). The purpose of this study is to describe a distinct new species ofDendroseius from Slovakia contributing thus to knowledge of Rhodacaridae European fauna. Our find- ing represents also a first record of the genus Dendroseius for Slovakia. An introduction of a new key to the identification of the world species based on females is a supplemen- tary aim of this paper. Materials and methods The mites were extracted from decomposing wood detritus by means of a modified Berlese-Tullgren funnel equipped with a 40-Watt bulb, and preserved in ethyl alcohol. Some specimens were collected by wet pincette from under loosen bark. Before iden- tification, the mites were mounted onto permanent microscope slides, using Swan’s chloral hydrate mounting medium. A Leica DM 1000 light microscope equipped with a Leica EC3 digital camera was used to obtain measurements and photos. Measure- ments were made from slide-mounted specimens. Lengths of idiosoma and shields A new species of Dendroseius 51 were measured along their midlines, and widths at their widest point (if not otherwise specified in the description), legs I–IV from coxal base but without the pretarsal ambulacrum. Idiosomal setae were measured from the bases of their insertions to their tips. Measurements are mostly presented as ranges (minimum to maximum). The terminology of dorsal and ventral chaetotaxy follows Lindquist and Evans (1965), and that for leg and gnathosomal setae follows that of Evans (1963a, 1963b). Results Dendroseius reductus sp. nov. http://zoobank.org/8C144F00-0FF6-4D7C-84AB-11A865AE85E1 Figs 1–10 Type material examined. Holotype female: SW Slovakia, Podunajská Rovina Flat- land, Bratislava Capital, Rusovce Settlement, hard-wood flood-plain forest Fraxino-( Ulmetum carpinetosum) with poplar (Populus sp.), 135 m a.s.l., March 7, 2020, detritus from a hollow of old and dying poplar tree. Paratype females: one specimen, with the same data as for holotype; three specimens, the same locality as in holotype, May 19, 2004, under bark of dead poplar tree. The type material is deposited at the Institute of Zoology, Slovak Academy of Sciences, Bratislava, Slovakia. Description (Female). Dorsal idiosoma (Figs 1, 7). Idiosoma oblong, regularly oval, widest at medial portion, 315–345 μm long and 195–220 μm wide (N = 5). Dorsal shield completely divided to podonotal and opisthonotal parts, not comple- tely covering dorsal surface, exposing narrow strips of lateral soft integument. Podo- notal shield 157–170 μm long and 170–175 μm wide, with smooth medial surface, delicate lateral reticulation, 17–18 pairs of setae (j1–j6, z1–z6, s2–s6, s1 symmetri- cally or asymmetrically situated on the shield and soft integument, respectively), and two pairs of scleronoduli between setae j5 and j6; outer scleronoduli larger and more conspicuous. Marginal setae r2, r4, r5 and R1 inserted in lateral soft integument, apparently outside the dorsal shields, and humeral setae r3 placed on peritrematal shields. Opisthonotal shield 165–180 μm long and 175–190 μm wide, finely reticu- late on whole surface, and bearing 19 pairs of setae (J1–J5, Z1–Z5, S1–S5, R2–R5). All dorsal setae smooth and needle-shaped, mostly similar in their lengths; setae z1 shortest (10–11 μm) and Z5 longest (35–40 μm); the lengths of some selected dorsal setae as follows: j1 16–19 μm, j3 21–23 μm, j5 17–21 μm, r5 24–28 μm, J1–J4 and Z1–Z3 18–23 μm, J5 17–19 μm, Z4 25–29 μm, S1–S4 21–25 μm, S5 27–30 μm, R2–R4 18–20 μm. Ventral idiosoma (Figs 2, 9). Tritosternum with long columnar base and two long and distinctly pilose laciniae. Presternal area lacking separate scutal elements. Ster- nal shield oblong, 90–100 μm long, 66–73 μm wide at level of constriction between coxae II, with smooth and weakly sclerotized but well-defined anteriormost portion possessing first pair of sternal setae and reaching level of first pair of lyrifissures (iv1); 52 Peter Mašán / ZooKeys 984: 49–57 (2020) Figures 1, 2. Dendroseius reductus sp. nov., female, with setal notation of idiosomal setae 1 dorsal idi- osoma 2 ventral idiosoma. Scale bar: 50 μm. posterior margin regularly convex and produced to relatively acute angles each bearing a metasternal seta (st4); the shield with fine reticulate pattern on lateral parts, four pairs of sternal setae (st1–st4) and three pairs of lyrifissures, iv1–iv3 (opening of iv1 and iv2 slit-like while iv3 suboval, iv1 with transverse position to the body axis while iv2 oriented longitudinally). Epigynal shield oblong, 50–60 μm wide, hyaline anteriorly (anterior margin obscure and not distinguishable), almost straight or widely rounded posteriorly, bearing one pair of setae (st5) and a pattern of longitudinal lines; genital lyrifissures (iv5) situated on soft integument behind st5, outside the shield. Four slit- like postgenital sclerites close to posterior margin of epigynal shield present. Peritremes shortened, 66–80 μm long, with anterior end reaching slightly beyond posterior margin of coxa II; peritrematal shields well-developed, free from podonotal shield, markedly narrowed behind coxae IV, bearing humeral setae (r3), and adjacent to anterior margin of podonotal shield close to paravertical setae z1 (Fig. 3). Three subtriangular exopodal platelets between
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